I used 4.7 as well and had no trouble getting X installed, and I was able to get twm, blackbox, gnome and sawfish installed, but I just couldnt figure out how to select the default window manager during the install. Keep in mind this was the first time I ever installed FreeBSD so I might have missed this. I wanted the default window manager to be blackbox, but it defaulted to twm.
1.Do you have XDM(login manager) running on your FreeBSD or not?

If not if you wanna use blackbox as your desktop you can do this :


-go to your shell and then type :
# echo "/usr/X11R6/bin/blackbox-session" > ~/.xinitrc and then reboot if this command not working try to changed "blackbox-session" with "blackbox"